It was found that the flow behaviour of both melts did not obey the power law exactly under experimental conditions, styron 492J melt shows more pronounced non -Newtonian properties than styron 498 melt.

• 实验发现,两试样熔体的流动均不严格地服从幂律; 在相同条件下,PS492J的非牛顿性较PS498明显;